Investigation of Thin Film Solar Cells Based on Cu2S and Ternary Compounds.

摘要

Thin films of the Cu-S system have been made by sulfurizing thin films of copper on n-type single crystal silicon substrates. The goal was to produce pure Cu2S films;however,under the conditions of the experiment,the films always contained additional phases,some unidentified,in addition to the Cu2S. The p-Cu(x)S/n-Si heterojunctions exhibit a photovoltaic effect. The short circuit current of the best of these solar cells is promising;the open circuit voltage is low and the curve factor was only 0.27. Work continues on improving the cells. Thin films of the Cu(x)S are being prepared on substrates like silica, pyrex glass,etc. The conductivity and Hall effect of such films have also been measured. Photovoltaic cells have also been made by the chemical substitution of Cu for Cd on single crystals of pure CdS,CdS containing small amounts of Te,and on CdSe. Modifications have been made in the crystal growth procedure for CuInS2and two crystals have been grown.